max8893. MAX889, MAX168x and other have a VERY LIMITED CURRENT, because of their limited power dissipation to 471mW at 70C. This allows for around 40mA with MAX1680.The MAX889 is a hh-frequency, regulated, 200mA, inverting charge pump that delivers a negative output voltage from a positive input. It has an adjustable output range, a logic-controlled shutdown mode, and a 0.1µA quiescent current.